The external windage and elevation adjustments on the ACOG Army Rifle Combat Optic (RCO) eliminate the need for tools and make lining up the perfect shot easier than ever. The red chevron-shaped reticle is lit using fiber optics and tritium, making it easy to see in daylight or at night. The included killFLASH prevents any glare or reflection from coming off your lens keeping your sight uninhibited, while you remain completely undetected. Waterproof up to 11m without caps. Bullet drop compensator. Bindon aiming concept. Forged aluminum housing. Includes one Thumbscrew Flattop Adapter for Picatinny rail, killFLASH Anti-Reflection Device, objective flip cap, LENSPEN, lanyard assembly for adjuster caps, Trijicon logo sticker, RCO manual, and a warranty card.